Call-box



S. R.. BOONE.

CALL BOX.

APPLICATION FILED IJULYY 2.1919.

1 ,359,023. Patented Nov. 16, 1920 IIfVENTOR UNITED, STATES SAMUEL R. BOONE, F BALTIMORE, MARYLAND.

CALL-BOX.

Application filed July 2, 1919.

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

' My invention relates to call boxes.

Que object of my invention is to produce a cali box which can be located near the desk of'a teller in a bank or near a counter in any business place and readily operated without notice of customers being attracted thereto. 7

A further object of my invention is to produce a call box which can be operated either directly by a push button mounted therein or by a. push button located at any distance therefrom.

A further object of my invention is to produce a call box which shall be silent in its operation and which will require but the slightest manual touch to start in operation.

A further object of my invention is to produce a simple, cheap and efiicient call box.

In carrying out my invention, I make use of the instrumentalities illustrated in the accompanying drawings, in which:

Figure 1 is a front View of my improved call box.

Fig. 2 is a section along the line 2-2 in Fig. 1 looking in the direction of the arrows.

Fig. 3 is a diagram of the connections.

Fig. 4 is an enlarged front view of the stopping index,

In the drawings represents one of the side frames used in my improved call box. There are two side frames such as 10 which are secured together at any suitable distance apart by any suitable number of posts such as 11 and in said side frames, there is revolubly mounted a main pintle 12 which is provided with a squared end for the application of a key. On this pintle, there is rigidly mounted one end of the spring 13, the other end of which is secured to one of the posts 11, in the usual manner.

The main gear 14 is revolubly mounted Specification of Letters Patent.

in the State of Maryland, have.

Patented Nov. 16, 1920.

Serial No. 308.106.

upon the pintle 12 and said pintle is provided with the usual ratchet pawl which cooperates in the usual manner with a ratchet wheel rigidly mounted upon the pintle 12.

There is any suitable arrangement of gearing between the main gear 14 and a pinion secured upon the break wheel pintle 15 and there is any suitable arrangement of gearing between said pintle and the fly pintle 16 upon which is mounted the fly 17.

All of the parts hereinbefore mentioned may be of any approved construction and as they form no part of my present invention they have not been particularly described.-

The special features now be described.

A block of insulating material 18 is secured upon the outer frame 10 and said block carries the binding posts 1919 to which are connected the terminals of the of my invention will .magnet 20, and the latter is secured upon the block 18 by the knee plate 21*. The armature 21 lies just above the poles of the magnet and said armature is secured to the lever 22 which is pivotally mounted as at 23 upon the frame 10 and is normally kept in the position shown in Fig. 1 by the extension spring 24. The right hand end of the lever 22 is formed into the hook 25 and it normally rests in the slot 26 in the index wheel 27. The left hand end of the lever 22 is provided with a hook 28 whi'h is normally in the path of the fly 17 as shown in Fig. 1 and prevents the fly from revolving.

The index wheel 27 is provided with a hub 29, (see Fig. 4), and the spring 30 is secured to said hub, said spring being formed with a hook portion 31 which projects into the slot 26 and the outer edge of said hook conforms to the cylindrical surface 32 of the index wheel 27. The break wheel 33 is secured upon the pintle 15 and said wheel is provided with any suitable number of points such as 34 which are located to make contact with the spring 35. The spring 35 is secured upon the insulating block 36 and the latter is secured upon the frame 10.

The guide block 37 is secured upon the frame 10 and said block is provided with a slot 38 for the reception of the frustoconical tappet 39 formed upon the end of the push rod 40 which is slidably mounted in a hole provided in the block 37 as shown button 41 and the block 37 serves to keep.

the parts in the positions shown in Fig. 2. The operation of my improved call box is V as follows One terminal of the calling circuit is to be connected to the spring 35 and the other terminal thereof is to be connected to the frame 10, and the calling circuit is normally open because the contact spring is not in contact with any of'the points'34,

This is the arrangement that is to be used when my callbox'is connected to an open circuit calling system, but if it is desired to use my improved call box upon a closed circuit calling system, then the break wheel 33 is to be formed in any approvedmanner so that the main calling circuit will be normally closed;

One of the binding. posts 19- is to be connected to a conductor 43 which connects with the battery 44 and said battery and the other bindingpost are to be connected to conductors 4545 which may be connected together as desired by suitable push buttons such as 46.

If now it is desired to send signals along the main calling circuit, the operator nearest the call box can push the button 41. This will bring the conical surface of the tappet 39-against the lever 22 and will push the left hand end of the lever 22 downwardly, thus moving the hook 25 outwardly from the slot 26. As soon as this is done the 'spring 30 forces the hook portion 31 underneath'the end of the hook25 and said.

hook is prevented from returning into said slot and stopping the call box. At the same time, the hook 28 is removed from contact with the fly l7 and the spring13 revolves the break wheel 33 and then the points 34 cooperate with the contact springj35 in sending the appropriate signal over the calling circuit.

An extension Should it be desired to send a signal from a point distant from the call box, a bush button, such as 46, is to be pushed and this will send a current of electricity through the .coils of the magnet 20 and the latter will attract the armature 21 and the. series of operations hereinbefore explained will take lace. I

It is to be noted that my improved call box is wound up and the mechanism is arranged so that it makes practically no sound during its operation; consequently, no one except'the person operating myiinproved call box will know that a signal has been sent. 7

After the hook portion 31 is moved underneath the end of the hook 25, as before explained, the index wheel 27 revolves in a clockwise direction as shown in Fig. 4 until the upper left edge of the hook 25 passes.

from the cylindrical surface 32 of said wheel and said edge strikes against the face of the hook portion 31, thus preventing said hook portion from moving with the wheel. The wheel continues to move until thelower right edge of the hook 25 is clear of the cylindrical surface 32 and then the spring 24 forces said hook within the slot 26 into the position shown in Fig. 4, thus stopping further movement of the index wheel 27.

In a call box, the combination with a gear train including a main spring, of an index wheel revolved by said spring, a slot in said wheel, a lever having a'hook for entering said slot, a spring mounted on said wheel and having a hook located in said slot and normally pressed against the hook on said lever, whereby when said last-named hook is released from said slot, the hook on said spring will; prevent its return until after said wheel has made one revolution.

SAMUEL R. BOONE. 

